Regular Expressions 101

Pro

^start of line

kpidata_nfilethe literal text kpidata_nfile (case sensitive)

Non-Capturing Group(?:(?!fileheader).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!fileheader)

fileheaderthe literal text fileheader (case sensitive)

.any Unicode character (except for line terminators)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

^kpidata_nfile(?:(?!fileheader).)*$

New

kpidata_nfile_20220919-20220925_fileheader.csv
kpidata_nfile_20220905-20220911.csv
othername_kpidata_nfile_20220905-20220911.csv

kpidata_nfile_20220919-20220925_fileheader.csv
kpidata_nfile_20220905-20220911.csv
othername_kpidata_nfile_20220905-20220911.csv